Yellow Storm Alert Issued for 12 Provinces This Wednesday, February 18

Storm warning in place for Wednesday

A yellow alert for thunderstorms has been issued for this Wednesday, February 18, 2026, covering areas across 12 provinces. The warning highlights the potential for weather conditions that can cause disruptions, particularly during the afternoon and night, when the most significant impacts are expected across large parts of the country.

The alert level indicates that storms may bring hazardous phenomena, even if they are not expected to be extreme everywhere. In practical terms, the forecast points to a day in which conditions can change quickly, with isolated storms developing and, in some locations, intensifying to strong or locally severe levels.

Provinces included in the yellow alert

The alert applies to certain zones within the following provinces:

• Salta
• Tucumán
• Catamarca
• La Rioja
• San Juan
• San Luis
• Mendoza
• Córdoba
• La Pampa
• Buenos Aires (does not include the City of Buenos Aires)
• Santa Fe
• Entre Ríos

Because the warning is issued for “some areas” within each province, the expected impacts may vary from one locality to another. Even within the same province, one area may see only brief rainfall while another experiences a stronger storm cell with heavier precipitation and gusty winds.

What kind of storms are expected

According to the forecast, the alerted area will be affected by isolated thunderstorms, with some storms potentially becoming strong or locally severe. These events may be accompanied by a combination of hazardous elements that often occur together during convective activity.

The main associated risks mentioned in the alert include:

• Hail, which can appear in brief bursts and may be localized.
• Intense electrical activity, including frequent lightning.
• Abundant precipitation in short periods, a pattern that can quickly overwhelm drainage in affected locations.
• Strong wind gusts, with speeds that may reach up to 80 km/h.

While storms are described as isolated, this does not necessarily mean they will be weak. Isolated storms can still be intense, and their impacts can be significant where the strongest cells develop, especially if heavy rain falls over a short timeframe or if wind gusts peak near the upper end of the forecast range.

Timing: afternoon and night most affected

The warning emphasizes that the phenomenon is expected to affect much of the country mainly during the afternoon and night. This timing matters because storm development often accelerates later in the day, and evening conditions can bring reduced visibility on roads as well as more difficulty in tracking rapidly changing weather.

For residents and travelers in the affected provinces, the afternoon-to-night window is the period most likely to bring the strongest downpours, the highest gusts, and the most frequent lightning. Even if the morning begins calm in some locations, conditions may deteriorate later as storm activity becomes more widespread.

Rainfall totals: expected ranges by region

Forecast precipitation totals vary by province group, with different accumulation ranges expected depending on the region. The alert provides two main brackets for accumulated rainfall.

Northwest and Andean-adjacent provinces—including Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza, and San Luis—are expected to see accumulated precipitation totals generally between 20 and 50 mm.

Central and eastern provinces—including Córdoba, Santa Fe, La Pampa, Buenos Aires, and Entre Ríos—could see higher totals, with forecast accumulations ranging from 30 to 70 mm.

These numbers refer to accumulated precipitation and are especially relevant in the context of the alert’s mention of “abundant precipitation in short periods.” When a large portion of the day’s total falls within a brief window, the immediate impacts can be more pronounced than the same total spread evenly over many hours.

Wind gusts up to 80 km/h

One of the key hazards highlighted is the potential for wind gusts reaching 80 km/h. Gusts of this magnitude can occur suddenly near storm cores and along outflow boundaries, sometimes arriving before the heaviest rain. In practical terms, this can lead to abrupt changes in conditions, including reduced stability for lightweight objects outdoors.

Because gusts are often localized and short-lived, not every area under the alert will necessarily experience the maximum value. However, the forecast indicates that the strongest storms could produce gusts approaching that threshold, making it an important factor for planning the day’s activities.

Hail and lightning: localized but potentially disruptive

The alert notes the possibility of hail and intense electrical activity. Both hazards can be highly localized: a storm may produce hail in one neighborhood or town while nearby areas see only heavy rain. Lightning, meanwhile, can occur even when rainfall is not at its peak, and frequent electrical activity is a common feature of strong convective storms.

Because hail and lightning are mentioned explicitly, the forecast is signaling that some storm cells could organize enough to generate these features. The combination of hail, strong gusts, and heavy short-duration rainfall is consistent with storms described as “strong or locally severe.”

High-elevation areas: snow and/or hail possible in the Puna

In the Puna region and at the highest levels of the mountain range, precipitation may fall mainly as snow and/or hail. This detail underscores how elevation can change the form of precipitation, even when lower elevations are dealing with rain and thunderstorms.

For communities and travelers in high-altitude areas, this can mean different conditions than those experienced in valleys and plains. The mention of snow and/or hail indicates that the coldest, highest terrain may see wintry or mixed precipitation during the event.

Why impacts can differ widely within the alert area

Thunderstorms described as isolated can produce a patchwork of outcomes. Some locations may receive repeated storm cells, pushing rainfall totals toward the upper end of the forecast range, while nearby places see shorter-lived activity. Similarly, wind gusts and hail are often tied to the most intense parts of a storm, which may only affect a narrow corridor.

This is why the alert is issued for broad areas but still emphasizes that only “some zones” are included in each province. The risk is not uniform, and the most meaningful indicator for individuals is whether storms develop overhead or pass close enough to bring strong outflow winds and heavy rain.

Summary of expected hazards

Across the provinces included in the yellow alert, the forecast points to a set of hazards that may occur together or separately depending on the storm:

• Isolated thunderstorms, some strong or locally severe
• Potential hail
• Intense lightning activity
• Heavy rain in short periods
• Wind gusts that may reach 80 km/h
• In the highest Puna and mountain areas, precipitation mainly as snow and/or hail

Rainfall accumulation is expected to range between 20–50 mm in Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza, and San Luis, and between 30–70 mm in Córdoba, Santa Fe, La Pampa, Buenos Aires (excluding the City of Buenos Aires), and Entre Ríos.

What to watch for during the day

With the most active period expected in the afternoon and night, conditions may evolve over the course of the day. In many storm setups, early signs can include increasing cloud cover and a growing chance of scattered cells that intensify later. The alert’s emphasis on short-duration heavy rain and gusts suggests that the most disruptive moments could be brief but intense.

For people moving between provinces or traveling within large provinces such as Buenos Aires or Córdoba, it is also important to remember that the warning does not cover every district equally. Some routes may remain largely unaffected while others pass through areas where storms are stronger.

Outlook for affected areas

The yellow alert for Wednesday, February 18, 2026, sets expectations for a potentially stormy afternoon and night across a wide swath of provinces. The combination of heavy rainfall in short bursts, lightning, gusty winds up to 80 km/h, and the chance of hail makes this a weather situation to monitor closely throughout the day, especially in the areas specifically included within each province.

In high-elevation zones of the Puna and the upper mountain range, the possibility of snow and/or hail adds another layer of complexity, reinforcing that conditions may differ sharply depending on altitude. Overall, the forecast points to a day where localized severe features are possible, and where rainfall totals may be substantial in the provinces expected to receive the higher accumulation range.